EP0603251B1 - 1-substituted 1h-imidazo(4,5-c)quinolin-4-amines; intermediate and pharmaceutical compositions - Google Patents

1-substituted 1h-imidazo(4,5-c)quinolin-4-amines; intermediate and pharmaceutical compositions Download PDF

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EP0603251B1
EP0603251B1 EP92919122A EP92919122A EP0603251B1 EP 0603251 B1 EP0603251 B1 EP 0603251B1 EP 92919122 A EP92919122 A EP 92919122A EP 92919122 A EP92919122 A EP 92919122A EP 0603251 B1 EP0603251 B1 EP 0603251B1
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EP0603251A1 (en
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John F. Gerster
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3M Co
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
    • C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D215/00—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems
    • C07D215/02—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom
    • C07D215/16—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D215/38—Nitrogen atoms
    • C07D215/42—Nitrogen atoms attached in position 4
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
    • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
    • C07D471/04—Ortho-condensed systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
    • C07H19/00—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof
    • C07H19/02—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof sharing nitrogen
    • C07H19/04—Heterocyclic radicals containing only nitrogen atoms as ring hetero atom
    • C07H19/052—Imidazole radicals

Definitions

  • This invention relates to 1H-imidazo[4,5-c]quinoline compounds.
  • this invention relates to 1H-imidazo[4,5-c]quinolin-4-amines, intermediates for the preparation of such compounds, pharmaceutical compositions containing such compounds, and pharmacological methods of using such compounds.
  • U.S. Pat. No. 4,698,348 discloses 1H-imidazo[4,5-c]quinolines that are active as bronchodilators, such as 4-substituted 1H-imidazo[4,5-c]quinolines wherein the 4-substituent is, inter alia, hydrogen, chloro, alkylamino, or dialkylamino, and the 2-substituent is, inter alia, hydroxyalkyl, aminoalkyl, or alkanamidoalkyl.
  • Said patent also discloses 3-amino and 3-nitro quinoline intermediates substituted at the 4-position by hydroxyalkylamino or cyclohexylmethylamino, and 1H-imidazo[4,5-c]quinoline N-oxide intermediates substituted at the 2-position with, inter alia, hydroxyalkyl, aminoalkyl, or alkanamidoalkyl.
  • This invention provides compounds of Formula I:
  • This invention provides intermediate compounds of the formula wherein R is as defined above, Y is -NO 2 or -NH 2 , and R 4 is alkoxyalkyl wherein the alkoxy moiety contains one to about four carbon atoms and the alkyl moiety contains one to about four carbon atoms.
  • This invention also provides intermediate compounds of the formula wherein Y and R are as defined above and R 5 is 2-, 3-, or 4-pyridyl.
  • This invention provides intermediate compounds of the formula wherein R, R 2 , and R 4 are as defined above.
  • This invention provides intermediate compounds of the formula wherein R, R 2 , and R 4 are as defined above.
  • This invention also provides intermediate compounds of the formula wherein R and R 2 are as defined above and R 6 is alkanoyloxyalkoxy methyl wherein the alkyl group contains one to about four carbon atoms, or tetrahydrofuranyl substituted by one or more substituents independently selected from the group consisting of alkanoyloxy, aroyloxy, and alkanoyloxyalkyl and aroyloxyalkyl wherein the alkyl group contains one to about four carbon atoms.
  • R 1 of Formula I is preferably alkoxyalkyl or 4-pyridyl.
  • substituents in compounds of Formula I that contain an alkyl radical preferably contain two carbon atoms or, more preferably, one carbon atom in each alkyl radical.
  • R of Formula I be hydrogen
  • Preferred compounds of Formula I include: 1-ethoxymethyl-1H-imidazo[4,5-c]quinolin-4-amine; 1-[(tetrahydro-2H-pyran-2-yl)methyl]-1H-imidazo[4,5-c]quinolin-4-amine; and 1-(2-pyridylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine.
  • Most preferred compounds of Formula I include 1-(2-methoxypropyl)-2-methyl-1H-imidazo[4,5-c]quinolin-4-amine, 1-(2-methoxyethyl)-2-methyl-1H-imidazo[4,5-c]quinolin-4-amine and 1-(4-pyridylmethyl)-1H-imidazo[4,5-c]-quinolin-4-amine.
  • Compounds of Formula I can be prepared by alkylating the 1-position of a 1H-imidazo[4,5-c]quinolin-4-amine with an alkylating agent of the formula (R' 1 )(R 1 )HC-X wherein R' 1 and R 1 are as defined above and X is chloro or bromo, in a polar solvent in the presence of sodium hydride.
  • R 1 comprises a hydroxyl group
  • the hydroxyl group can be protected for the alkylation step and subsequently deprotected.
  • Suitable protecting groups include alkanoyloxy (e.g., acetoxy) or aroyloxy (e.g., benzoyloxy or p-toloyloxy).
  • R and R 2 are as defined above and R E is a substituent capable of being subjected to an elimination or like reaction to afford a 1H-imidazo[4,5-c]quinolin-4-amine.
  • R E can be any substituent that can be removed. Examples of general classes of R E include groups that will yield a stable cation upon treatment with aqueous acid (e.g.
  • R E substituents include 1,1-dimethylethyl (i.e., t-butyl), 1,1-dimethyl-2-hydroxyethyl, 2-hydroxy-1-phenyl-1-methylethyl, 1,1-dimethyl-2-hydroxypropyl.
  • Step (1) can be conducted by reacting the 4-hydroxy-3-nitroquinoline of Formula II with 1-2 moles of phosphorus oxychloride per mole of the 4-hydroxy-3-nitroquinoline of Formula II.
  • the reaction can be conducted in N,N-dimethylformamide and can be accompanied by heating.
  • step (2) a 3-nitro-4-chloroquinoline of Formula III is reacted by heating with a compound of the formula R E NH 2 , wherein R E is as defined above, in a suitable solvent such as dichloromethane, water, or tetrahydrofuran, and optionally in the presence of a tertiary amine catalyst such as triethylamine to provide a quinoline of Formula IV.
  • a suitable solvent such as dichloromethane, water, or tetrahydrofuran
  • a tertiary amine catalyst such as triethylamine
  • Steps (1) and (2) can be combined such that the 3-nitro-4-chloroquinoline need not be isolated prior to reaction with R E NH 2 .
  • Such a reaction is exemplified in Example 134 and Example 188 (Step A) of U.S. Pat. 4,689,338, the disclosure of which is incorporated herein by reference.
  • a compound of Formula IV is reduced in step (3) preferably using a catalyst such as platinum on charcoal, to provide a compound of Formula V.
  • the reduction can be carried out conveniently on a Paar apparatus in an inert solvent such as toluene or a lower alkanol.
  • step (4) an intermediate compound of Formula V is reacted with (i) a 1,1-dialkoxyalkyl alkanoate such as diethoxymethyl acetate, or (ii) a carboxylic acid that will introduce the desired R 2 group, or (iii) a trialkyl ortho ester of the formula R 2 C(Oalkyl) 3 , wherein "alkyl” is an alkyl group containing 1 to about 4 carbon atoms, or (iv) a combination of such a carboxylic acid with such a trialkyl ortho ester to provide a compound of Formula VI.
  • the reaction can be carried out by heating, e.g., at about 130°C, in the presence of an acid, preferably an alkanoic acid having one more carbon atom than R 2 .
  • Step (5) provides an intermediate of Formula VII.
  • the hydroxy group if one is present in R E , is protected with, for example, an alkanoyloxy group such as acetoxy, or with benzoyloxy.
  • an alkanoyloxy group such as acetoxy
  • benzoyloxy Such protecting groups and reactions for their placement and removal are well known to those skilled in the art. See, for example, U.S. Pat. No. 4,689,338, Examples 115 to 123.
  • the resulting protected compound is then oxidized with a conventional oxidizing agent that is capable of forming N-oxides. Suitable oxidizing agents include peroxyacids and hydrogen peroxide. Heating is generally employed to accelerate the rate of reaction.
  • step (6) an N-oxide of Formula VII is first heated in the presence of a suitable chlorinating agent such as phosphorus oxychloride to provide an intermediate of Formula VIII.
  • a suitable chlorinating agent such as phosphorus oxychloride
  • Phosphorus oxychloride can be used in combination with a solvent (e.g., dichloromethane) inert to conventional chlorinating agents, optionally in the presence of a catalytic amount of N,N-dimethylformamide.
  • the second part of step (6) involves removal of the protecting group, if one is present, by methods well known to those skilled in the art.
  • step (7) the 4-chloro group is replaced by a 4-amino group to provide a compound of Formula IX.
  • the intermediate of Formula VIII can be heated, e.g., at 125° to 175°C under pressure for 6-24 hours in a sealed reactor in the presence of either ammonium hydroxide or a solution of ammonia in an alkanol, (e.g., 15% ammonia in methanol).
  • a compound of Formula IX is heated in the presence of aqueous acid to effect the deamination of the R E group, thus providing a 1H-imidazo[4,5-c]- quinolin-4-amine of Formula X.
  • Preferred conditions for the reaction include brief (e.g., 30 minutes) reflux in dilute (e.g. 4N) aqueous hydrochloric acid.
  • Step 1 of Scheme II involves reacting a compound of Formula III in an inert solvent with an amine of the formula R 1 CH 2 NH 2 to provide a compound of Formula XI.
  • the reaction of step 1 can be carried out in the presence of a tertiary amine catalyst (such as triethylamine).
  • Step 2 involves: (i) reduction of the nitro group of the compound of Formula XI as described above in connection with step (3) of Scheme I; (ii) reaction of the resulting 3-amino compound with a carboxylic acid or an equivalent thereof as described above in connection with step (4) of Scheme I in order to provide a cyclized imidazo[4,5-c]quinoline; and (iii) oxidizing the quinoline nitrogen as described above in connection with step (5) of Scheme I to provide the N-oxide of Formula XII.
  • Step (3) involves (i) reacting a compound of Formula XII with an acylating agent; (ii) reacting the product with an aminating agent; and (iii) isolating the compound of Formula I.
  • Part (i) of step (3) involves reacting an N-oxide with an acylating agent.
  • Suitable acylating agents include alkyl- or aryl- sulfonyl chlorides (e.g., benzenesulfonyl chloride, methanesulfonyl chloride, p-toluenesulfonyl chloride).
  • Part (ii) of step (3) involves reacting the product of part (i) with an excess of an aminating agent.
  • Suitable aminating agents include ammonia (e.g., in the form of ammonium hydroxide) and ammonium salts (e.g., ammonium carbonate, ammonium bicarbonate, and ammonium phosphate).
  • Ammonium hydroxide is preferred.
  • the reaction of step (3) is preferably carried out by dissolving the N-oxide of Formula XII in an inert solvent such as methylene chloride, adding the aminating agent to the solution, and then adding the acylating agent.
  • Preferred conditions involve cooling to about 0°C to about 5°C during the addition of the acylating agent. Heating or cooling can be used to control the rate of the reaction.
  • the unsubstituted compound of Formula XIII, 4-hydroxy-2(1H)-quinolinone, is a known, commercially available compound, and other compounds of Formula XIII can be prepared therefrom by methods known to those skilled in the art.
  • Chem. Ber. , 1927, 60 , 1108 discloses the preparation of 7-chloro-4-hydroxy-2(1H)-quinolinone.
  • a compound of Formula XIII is nitrated at the 3-position using conventional nitration methods. It is known to those skilled in the art, however, that nitration is not necessarily selective. For example, depending on the particular R substituent in a compound of Formula XIII and the particular conditions employed, nitration might occur on the benzo ring of a compound of Formula XIII. Those skilled in the art, however, are able to select appropriate conditions that will afford a compound of Formula XIV. Suitable conditions involve mild heating (e.g., at about 40°C) with acetic acid as the solvent.
  • the unsubstituted compound of Formula XIV, 4-hydroxy-3-nitro-2(1H)quinoline is known and the preparation thereof is disclosed in Chem. Ber. , 1918, 51 , 1500 (Gabriel), the disclosure of which is incorporated herein by reference.
  • step (2) the nitrated compound of Formula XIV is chlorinated with a suitable chlorinating agent such as phosphorus pentachloride or phosphorus oxychloride to provide the dichloride product of Formula XV.
  • a suitable chlorinating agent such as phosphorus pentachloride or phosphorus oxychloride.
  • the reaction can be carried out in an inert solvent or if appropriate in neat chlorinating agent. Mild heating serves to accelerate the rate of reaction.
  • the unsubstituted compound of Formula XV, 2,4-chloro-3-nitroquinoline, is known and the preparation thereof is disclosed in Gabriel cited above.
  • steps (2) and (3) can be carried out without isolation of the compound of Formula XV.
  • Such a process involves carrying out the reaction of step (2), careful hydrolysis of unreacted chlorinating agent at a relatively low temperature (e.g., below about 35°C), separating the organic layer, removing the product of Formula XV from the remaining aqueous layer by extraction with an organic solvent, and using the combined organic extracts as described below in connection with step (3).
  • step (3) a compound of Formula XV is substituted at the 4-position by reaction with an excess of a compound of the formula R 7 CH 2 NH 2 , wherein R 7 is as defined above. It is sometimes necessary to use gentle heating (e.g., 50°C). This reaction proceeds selectively, affording only the 4-substituted product and no detectable amount of the 2-substituted compound.
  • the reaction is run in a solvent comprising a base such as triethylamine or pyridine.
  • step (3) is run independent of step (2), the reaction can be carried out in a neat basic solvent such as triethylamine. Gentle heating (e.g., at about 70°C) is preferred.
  • step (4) a compound of Formula XVI is reduced to afford a compound of Formula XVII.
  • This reduction can be carried out by conventional methods such as by electrochemical reduction, by reaction with metals such as zinc, tin, or iron in acid, and by other conventional single step or multi-step methods known to those skilled in the art.
  • Suitable reduction conditions include conventional homogeneous or preferably heterogeneous catalytic hydrogenation conditions.
  • a compound of Formula XVI is suspended or dissolved in a solvent such as ethanol, ethyl acetate, methanol, isopropyl alcohol, or mixtures thereof with acetic acid, in the presence of a suitable heterogeneous hydrogenation catalyst such as a platinum or rhodium on alumina, palladium on carbon, platinum on carbon, or the like under hydrogen pressure (e.g., 1-5 atm) in a steel bomb.
  • a suitable heterogeneous hydrogenation catalyst such as a platinum or rhodium on alumina, palladium on carbon, platinum on carbon, or the like under hydrogen pressure (e.g., 1-5 atm) in a steel bomb.
  • Isopropyl alcohol is the preferred solvent.
  • step (5) a compound of Formula XVII is reacted with an orthoester or an orthoformate of the formula R 2 C(O-Alkyl) 3 or a carboxylic acid of the formula R 2 CO 2 H or a mixture thereof, as described above in connection with step (4) of Scheme I.
  • step (6) a compound of Formula XVIII is reacted with ammonia as described above in connection with step (7) of Scheme I to afford a compound of Formula XIX.
  • Compounds of Formula I can be isolated by the conventional means disclosed in U.S. Pat. No. 4,689,338 (Gerster), such as, for example, removal of the solvent and recrystallization from an appropriate solvent (e.g., N,N-dimethylformamide) or solvent mixture, or by dissolution in an appropriate solvent (such as methanol) and re-precipitation by addition of a second solvent in which the compound is insoluble.
  • an appropriate solvent e.g., N,N-dimethylformamide
  • solvent mixture e.g., methanol
  • a compound of Formula I can be used as an antiviral agent itself or it can be used in the form of a pharmaceutically acceptable acid-addition salt such as a hydrochloride, dihydrogen sulfate, trihydrogen phosphate, hydrogen nitrate, methanesulfonate or a salt of another pharmaceutically acceptable acid.
  • a pharmaceutically acceptable acid-addition salt of a compound of Formula I can be prepared, generally by reaction of the compound with an equimolar amount of a relatively strong acid, preferably an inorganic acid such as hydrochloric, sulfuric, or phosphoric acid, or an organic acid such as methanesulfonic acid, in a polar solvent. Isolation of the salt is facilitated by the addition of a solvent, such as diethyl ether, in which the salt is insoluble.
  • a compound of the invention can be formulated for the various routes of administration in a pharmaceutically acceptable vehicle, such as water or polyethylene glycol, along with suitable adjuvants, excipients, and the like. Particular formulations will be easily selected by those skilled in the art. Suitable formulations for topical application include creams, ointments and like formulations known to those skilled in the art. Formulations generally contain less than 10% by weight of a compound of Formula I, preferably about 0.1% to 5% by weight of a compound of Formula I.
  • the compounds of Formula I exhibit antiviral activity in mammals. They can therefore be used to control viral infections.
  • a compound of Formula I can be used as an agent to control infections in mammals caused by Type II Herpes simplex virus.
  • Compounds of Formula I can also be used to treat a herpes infection by oral, topical, or intraperitoneal administration.
  • a number of compounds of Formula I were tested and found to induce biosynthesis of interferon in human cells.
  • the test methods and results are set forth below. These results suggest that at least certain compounds of the invention might be useful in treating other diseases such as rheumatoid arthritis, warts, eczema, Hepatitis B, psoriasis, multiple sclerosis, essential thrombocythemia, cancer such as basal cell carcinoma, and other neoplastic diseases.
  • Example 2 Using the general method of Example 1, 5.0 g of 1H-imidazo[4,5-c]quinolin-4-amine was reacted with (2-acetoxyethoxy)methyl bromide (prepared according to the method of Robins et al., Can. J. Chem. 60, 547 (1982)) to provide 5.3 g of a yellow solid. The solid was slurried with ethyl acetate to provide 2.3 g of a light yellow solid which was identified as the 1-isomer by nuclear magnetic resonance spectroscopy.
  • a mixture containing 12.5 g of N-(2-methoxyethyl)-3-nitro-4-quinolinamine, 0.6 g of 5% platinum on carbon, 10 g of magnesium sulfate and 380 mL of ethyl acetate was hydrogenated in a Parr apparatus at an initial pressure of about 53 psi. After the hydrogenation was complete, the reaction mixture was filtered. The filtrate was evaporated under vacuum to provide the diamine intermediate as a clear amber oil. The oil was taken up in 150 mL of glacial acetic acid and the resulting solution was refluxed for one and a half hours before being evaporated under vacuum. The resulting residue was dissolved in water.
  • Example 14 0.8 g of 4-chloro-1-(4-pyridylmethyl)-1H-imidazo[4,5-c]quinoline was aminated to provide 0.25 g of 1-(4-pyridylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine, m.p. >300°C. Analysis: Calculated for C 16 H 13 N 5 : %C, 69.8; %H, 4.8; %N, 25.4; Found: %C, 70.2; %H, 4.9; %N, 25.5.
  • reaction mixture was concentrated under vacuum to provide a yellow precipitate which was collected, rinsed with water and a small amount of ethanol and dried to provide 45 g of a yellow crystalline solid.
  • a 1 g portion was recrystallized to provide 1-[(3-nitro-4-quinolinyl)amino]-2-propanol as a yellow crystalline solid, m.p. 209-210°C.
  • the structure was confirmed by nuclear magnetic resonance spectroscopy.
  • Example 9 Using the general method of Example 9, 44.2 g of 1-[(3-nitro-4-quinolinyl)amino]-2-propanol was hydrogenated to provide the intermediate diamine as a brown oil. Using the general method of Example 9, 17 g of the crude diamine was reacted with glacial acetic acid to provide 6.3 g of crude product. A sample was recrystallized from ether to provide ⁇ ,2-dimethyl-1H-imidazo[4,5-c]quinoline-1-ethanol as a blue tinged solid, m.p. 176-177°C. The structure was confined by nuclear magnetic resonance spectroscopy.
  • Example 10 Using the general method of Example 10, 2.4 g of 1-(2-methoxypropyl)-2-methyl-1H-imidazo[4,5-c]quinoline was oxidized using peracetic acid to provide 2.65 g of the crude N oxide as a yellow solid. A 100 mg sample was recrystallized from ethyl acetate to provide 1-(2-methoxypropyl)-2-methyl-1H-imidazo[4,5-c]quinoline 5N oxide as a solid, m.p. 146-149°C. The structure was confirmed by nuclear magnetic resonance spectroscopy.
  • test methods described below demonstrate the ability of compounds of the invention to reduce the number and severity of lesions developed by guinea pigs infected with Type II Herpes simplex virus and to induce the biosynthesis of interferon in guinea pigs.
  • mice Female Hartley guinea pigs weighing 200 to 250 g are anesthetized with methoxyflurane (available under the tradename METAFANETM from Pitman-Moore, Inc., Washington Crossing, NJ), after which the vaginal area is swabbed with a dry cotton swab. The guinea pigs are then infected intravaginally with a cotton swab saturated with Herpes simplex virus Type II strain 333 (1 X 10 5 plaque forming units/mL). Guinea pigs are assigned to groups of 7 animals; one group for each treatment and one to serve as a control (vehicle treated).
  • methoxyflurane available under the tradename METAFANETM from Pitman-Moore, Inc., Washington Crossing, NJ
  • METAFANETM methoxyflurane
  • the guinea pigs are then infected intravaginally with a cotton swab saturated with Herpes simplex virus Type II strain 333
  • the compounds of the invention are formulated in water containing 5% Tween 80 (a polyoxyethylene sorbitan monooleate available from Aldrich Chemical Company, Inc., Milwaukee, WI).
  • Tween 80 a polyoxyethylene sorbitan monooleate available from Aldrich Chemical Company, Inc., Milwaukee, WI.
  • the guinea pigs are treated orally once daily for four consecutive days starting 24 hours after infection.
  • Antiviral activity is evaluated by comparing lesion development in compound-treated versus vehicle-treated guinea pigs. External lesions are scored 4, 7, 8 and 9 days after infection using the following scale: 0 - no lesion, 1 - redness and swelling, 2 - a few small vesicles, 3 - several large vesicles, 4 - large ulcers with necrosis and 5 - paralysis. The maximum lesion score of each guinea pig is used to calculate the percentage lesion inhibition. The percentage lesion inhibition is calculated as follows:
  • blood is obtained from 3 guinea pigs from each treatment group by cardiac puncture of methoxyflurane anesthetized animals. Blood is pooled and allowed to clot at room temperature. After low speed centrifugation, serum is collected and stored at -70°C until analysis.
  • Interferon levels in the guinea pig serum are determined in a standard microtiter assay using transformed guinea pig cells (ATCC CRL 1405). The interferon assay is done in 96 well microtiter plates. Confluent monolayers of transformed guinea pig cells are treated with dilutions of guinea pig serum made with medium 199 (GIBCO, Grand Island, NY). The cell and serum dilutions are incubated at 37°C overnight. The following day, the medium and serum are removed and about 10 plaque forming units of Mengovirus are added to each well. Controls consist of wells that receive no guinea pig serum (virus positive control) and wells that receive no virus (virus negative control).
  • Cells and virus are incubated for 2 to 3 days at 37°C before quantifying for viral cytopathic effect.
  • the viral cytopathic effect is quantified by staining with 0.05% crystal violet followed by spectrophotometric absorbance measurements.
  • the titer of interferon in serum is expressed as units/mL and is the reciprocal of the highest dilution that protects cells from virus.
  • test methods described below demonstrate the ability of compounds of the invention to induce the biosynthesis of interferon- ⁇ in human cells.
  • Peripheral blood mononuclear cells are prepared by LeucoPREPTM Brand Cell Separation Tubes (available from Becton Dickinson) and cultured in RPMI 1640 medium (available from GIBCO, Grand Island, NY) containing 25 mM HEPES 4-(2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid and L-glutamine (1% penicillin-streptomycin solution added) with 10% autologous serum added.
  • whole blood diluted 1:10 with RPMI 1640 medium supplemented with 25 mM HEPES and L-glutamine with 1% penicillin-streptomycin solution added can be used. 200 ⁇ L portions of diluted whole blood or of PBM in medium are added to 96 well (flat bottom) MicroTestTMIII tissue culture plates.
  • the compounds are solubilized in water, ethanol, or dimethyl sulfoxide and then diluted with distilled water, 0.01N sodium hydroxide or 0.01N hydrochloric acid. (The choice of solvent will depend on the chemical characteristics of the compound being tested.)
  • test compound is added (in a volume less than or equal to 50 ⁇ L) to the wells containing 200 ⁇ L of PBM in medium or diluted whole blood.
  • Solvent and/or medium is added to control wells (i.e., wells with no test compound) and also as needed to adjust the final volume of each well to 250 ⁇ L.
  • the plates are covered with plastic lids, vortexed gently and then incubated for 24 hours at 37°C with a 5% carbon dioxide atmosphere.
  • the plates are covered with PARAFILMTM and then centrifuged at 1000 rpm for 15 minutes at 4°C in a Damon IEC Model CRU-5000 centrifuge.
  • Medium about 175 ⁇ L is removed from 4 to 8 wells and pooled into 2 mL sterile freezing vials. Samples are maintained at -70°C until analysis.
  • Interferon is determined by bioassay using A549 human lung carcinoma cells challenged with encephalomyocarditis.
  • the details of the bioassay method are described by G. L. Brennan and L. H. Kronenberg in "Automated Bioassay of Interferons in Micro-test Plates", Biotechniques, June/July; 78, 1983., incorporated herein by reference. Briefly stated the method is as follows: interferon dilutions and A549 cells are incubated at 37°C for 12 to 24 hours. The incubated cells are infected with an inoculum of encephalomyocarditis virus.
  • the infected cells are incubated for an additional period at 37°C before quantifying for viral cytopathic effect.
  • the viral cytopathic effect is quantified by staining followed by spectrophotometric absorbance measurements.
  • Results are expressed as ⁇ interferon reference units/mL based on the value obtained for NIH HU IF-L standard.
  • the interferon was identified as essentially all interferon alpha by testing in checkerboard neutralization assays against rabbit anti-human interferon (beta) and goat anti-human interferon (alpha) using A549 cell monolayers challenged with encephalomyocarditis virus. Results are shown in the table below wherein the absence of an entry indicates that the compound was not tested at the particular dose concentration.
  • results designated as " ⁇ " indicate that interferon was not detectable in amounts above the lower sensitivity level of the assay.
  • Dose Concentration ⁇ g/mL

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EP92919122A 1991-09-04 1992-08-26 1-substituted 1h-imidazo(4,5-c)quinolin-4-amines; intermediate and pharmaceutical compositions Expired - Lifetime EP0603251B1 (en)

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Application Number Priority Date Filing Date Title
US07/754,610 US5268376A (en) 1991-09-04 1991-09-04 1-substituted 1H-imidazo[4,5-c]quinolin-4-amines
US754610 1991-09-04
PCT/US1992/007226 WO1993005042A1 (en) 1991-09-04 1992-08-26 1-substituted 1h-imidazo(4,5-c)quinolin-4-amines; intermediate and pharmaceutical compositions

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EP0603251A1 EP0603251A1 (en) 1994-06-29
EP0603251B1 true EP0603251B1 (en) 2000-10-18

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